condition mean min max ZT0-3 7.8916570660000005 4.4079824919999995 11.37533164 ZT4-7 29.15693706 18.52353592 39.7903382 ZT8-11 50.6497547875 47.713495175 53.586014399999996 ZT12-15 41.384029007500004 34.951903305 47.81615471 ZT16-19 20.3162657325 19.24009906 21.392432405 ZT20-23 19.2505747975 17.756501515 20.744648079999997